\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Leaks \label{leaks}}
\begin{tabular}{l*{5}{c}}
\hline\hline
                &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}\\
                &\multicolumn{1}{c}{sum\_leaks\_possEU}&\multicolumn{1}{c}{sum\_leaks\_possEU}&\multicolumn{1}{c}{sum\_leaks\_possEU}&\multicolumn{1}{c}{response residual}&\multicolumn{1}{c}{working residual}\\
                &     b/se         &     b/se         &     b/se         &     b/se         &     b/se         \\
\hline
main            &                  &                  &                  &                  &                  \\
Mean Right-Left &    -0.05         &    -0.05         &    -0.08         &                  &                  \\
                &   (0.09)         &   (0.10)         &   (0.15)         &                  &                  \\
Mean R-L Political Polarization&                  &    -0.01         &     0.04         &                  &                  \\
                &                  &   (0.05)         &   (0.23)         &                  &                  \\
B-spline on [1976m4,2015m12)&                  &                  &     4.94         &                  &                  \\
                &                  &                  &  (84.47)         &                  &                  \\
B-spline on [1986m3,2025m11)&                  &                  &     7.07         &                  &                  \\
                &                  &                  &  (12.47)         &                  &                  \\
B-spline on [1996m2,2035m10)&                  &                  &     9.13         &                  &                  \\
                &                  &                  &  (31.93)         &                  &                  \\
B-spline on [2006m1,2045m9)&                  &                  &     0.00         &                  &                  \\
                &                  &                  &      (.)         &                  &                  \\
Mean Right-Left (residuals)&                  &                  &                  &    -0.02         &    -0.06         \\
                &                  &                  &                  &   (0.04)         &   (0.18)         \\
Mean R-L Political Polarization (residuals)&                  &                  &                  &    -0.01         &    -0.02         \\
                &                  &                  &                  &   (0.02)         &   (0.10)         \\
Constant        &    -1.01\sym{***}&    -0.46         &   -10.57         &     0.01         &     0.03         \\
                &   (0.32)         &   (2.43)         &  (17.96)         &   (0.10)         &   (0.41)         \\
\hline
N               &      117         &      117         &      117         &      117         &      117         \\
R-squared       &                  &                  &                  &     0.00         &     0.00         \\
\hline\hline
\multicolumn{6}{l}{\footnotesize \sym{*} \(p<0.10\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\)}\\
\end{tabular}
\end{table}
